Ear-inner Ear

Question 1

Inner ear Also known as

Answer 1

Labyrinth

Question 2

Two parts of the labyrinth

Answer 2

Membranous and Bony

Question 3

Which fluid is it inner ear filled with

Answer 3

Endolymph

Question 4

Endolymph is produced by

Answer 4

Stria vascularis

Question 5

Endolymph absorbed by

Answer 5

Endolymphatic sac

Question 6

Inner ear surrounded by which fluid

Answer 6

Perilymph

Question 7

What is the Perilymph composed of

Answer 7

CSF

Question 8

How does the CSF go to the inner ear to become perilymph

Answer 8

Through the aqueduct of cochlea

Question 9

Relative potassium and sodium levels in endolymph and perilymph

Answer 9

Endolymph- high K low Na

Perilymph- high Na low K

Question 10

Sensory end organ of cochlea

Answer 10

Organ of corti

Question 11

How many turns does cochlea have

Answer 11

2and3/4

Question 12

What is the apex and the basal turn sense what frequencies

Answer 12

Apex – senses low-frequency sounds

Basal turn – senses high frequency sounds

Question 13

Apex of the cochlea is also known as

Answer 13

Helicotrema

Question 14

What is the axis of the cochlea also known as

Answer 14

Modiolus

Question 15

Sections of cochlea

Answer 15

Scala vestibuli
Scala media
Scala tympani

Question 16

Membranes in the cochlea

Answer 16

Reissner’s membrane
Tectorial membrane
Basilar membrane

Question 17

Organ of corti present on which membrane

Answer 17

Basilar membrane

Question 18

Travelling wave theory given by

Answer 18

Von bekesy

Question 19

Connection between cochlea and saccule

Answer 19

Ductus reuniens

Question 20

What does the utricle and saccule also known as

Answer 20

Vestibule

Otolithic organ

Question 21

What is the function of the utricle and the saccule

Answer 21

Utricle controls horizontal linear balance

Saccule Controls vertical linear balance

Question 22

Sensory end organ of vestibule

Answer 22

Macula

Question 23

Where are the otoconia is present

Answer 23

Macula

Question 24

Main pathology of BPPV

Answer 24

Benign paroxysmal positional vertigo

It is due to displacement of otoconia that reaches the SCC

Question 25

Describe nystagmus in BPPV

Answer 25

Several seconds latency Geotropic Horizontal – rotatory Last no more than 30 seconds before abating Fatigues with repetition of hallpikes maneuver

Question 26

Diagnostic test in BPPV

Answer 26

Dix-hallpike manoeuvre

Question 27

Treatment of BPPV

Answer 27

Epley’s manoeuvre

Question 28

Types of semi circular canals

Answer 28

Lateral Posterior Superior

Question 29

Function of semi circular canals

Answer 29

Angular balance

Question 30

Sensory end organs of semicircular canal

Answer 30

Crista

Question 31

Cupula

Answer 31

Crista is covered by gelatinous layer called cupula

Question 32

Bithermal caloric test

Answer 32

Used to check the lateral semicircular canal EAC is irrigated with warm and cold water Produces nystagmus Direction – COWS